[Pore surface not red or orange; pore surface not bruising blue to greenish blue; cut flesh not staining blue to bluish on exposure; found east of the Rocky Mountains, or in Texas; mature pore surface and/or spore print with olive shades; stem not reticulate.]

Note: This key is in bad need of revision. The non-dichotomous format is annoying and, with the hindsight of a few years, I see many areas that require different emphasis, fleshing out, paring down, and so on. Don't hold your breath waiting, but I will eventually revise the key completely.

° Cap slimy, very wrinkled, orange-brown; pore surface white to pale yellow becoming olive, not bruising; stem whitish to brownish, with white scabers that do not darken in age; flesh white, staining pink on exposure; cap bright red with ammonia; spores 14-19 µ long; found under oak; known only from western New York. (4/4)

Note: The mushrooms below are notoriously difficult to separate, and I suspect there are many similar North American boletes that are not included in the literature, which tends to represent boletes found in areas of the continent where bolete specialists (rather than boletes) are distributed.